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2(-9+4a)+7=0
We simplify the equation to the form, which is simple to understand
2(-9+4a)+7=0
Reorder the terms in parentheses
+(-18+8a)+7=0
Remove unnecessary parentheses
-18+8a+7=0
We move all terms containing a to the left and all other terms to the right.
+8a=0+18-7
We simplify left and right side of the equation.
+8a=+11
We divide both sides of the equation by 8 to get a.
a=1.375
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